The poet does more than claim to be loyal. He supplies two kinds of service: searching for Maʿbad’s camels and appearing when the family faces hardship. This moves the complaint from an abstract declaration of loyalty to specific actions offered as evidence.
The named relative in nashadtu ... ḥamūlata Maʿbad and the conditional readiness in matā yaku ... ashhadi complement one another. They are part of the speaker’s defense as presented within the poem, not independently established biographical records.